package com.wsz.commonutils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.util.StringUtils;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;

    /**
     * @author
     * @since
     */
    public class JwtUtils {

        public static final long EXPIRE = 1000 * 60 * 60 * 24;//token过期时间

        public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO";//密钥

        //生成token
        public static String getJwtToken(String id, String nickname){

            String JwtToken = Jwts.builder()
                    .setHeaderParam("typ", "JWT")
                    .setHeaderParam("alg", "HS256")
                    .setSubject("OE-user")

                    .setIssuedAt(new Date())//设置过期时间
                    .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))

                    .claim("id", id)//设置token主体
                    .claim("nickname", nickname)


                    .signWith(SignatureAlgorithm.HS256, APP_SECRET)
                    .compact();

            return JwtToken;
        }

        /**
         * 判断token是否存在与有效
         * @param jwtToken
         * @return
         */
        public static boolean checkToken(String jwtToken) {
            if(StringUtils.isEmpty(jwtToken)) return false;
            try {
                Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
            return true;
        }

        /**
         * 判断token是否存在与有效
         * @param request
         * @return
         */
        public static boolean checkToken(HttpServletRequest request) {
            try {
                String jwtToken = request.getHeader("token");
                if(StringUtils.isEmpty(jwtToken)) return false;
                Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
            return true;
        }

        /**
         * 根据token获取会员id
         * @param request
         * @return
         */
        public static String getMemberIdByJwtToken(HttpServletRequest request) {
            String jwtToken = request.getHeader("token");
            if(StringUtils.isEmpty(jwtToken)) return "";
            Jws<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
            Claims claims = claimsJws.getBody();
            return (String)claims.get("id");
        }
    }

